Stamp-mill.



J. P. SYMUN STA ION

ATENTED APR. 24, 1906. LL.

S & W. H. PAU

MP MILL.

FILED NOV. 18

J66 72.115 mm? L m n 2 l l I i 1 I l o I n I l l l l I 1: I I g} itnesses QZZZZ nven tor UNITED STATES OFFICE.

JOSEPH FRANCIS SYMONS AND WILLIAM H. PAULL, OF LAKE LINDEN, MICHIGAN.

STAMP-MILL.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed November 18, 1905. Serial No. 288.023.

To all whmrt it may concern.-

Be it known that we, Josnrn FRANCIS Srnoxs and VILLIAH II. PAULL, citizens of the United States, residing at Lake Linden, in the county of I-Ioughton and State of Michigan, have invented a new and useful Stamp-Mill, of which the following is a specification.

This invention relates to stamp -n1ills wherein steam or other fluid pressure is employed for lifting the stamp-shaft, and has for its object to insure the prompt return or downward movement of the shaft without starting the same by fluid-pressure. In other words, it is proposed to employ fluid-pressure for lifting or elevating the shaft only, thereby to materially reduce and simplify the valve mechanism for operating the mill. In this connection it is designed to provide for cushioning the upstroke of the stamp-shaft and to employ the reaction of the cushion for giving the stamp-shaft an initial return movement to insure the prompt and effective dropping thereof.

Another object is to enable the equipment of an ordinary stamp-mill with the cushioning means of the present invention without requiring any material alteration therein beyond the provision of seats for the cushioning elements and the restriction of the valve mechanism to a single valve.

I/Vith these and other objects in view the present invention consists in the combination and arrangement of parts, as will be hereinafter more fully described, shown in the accompanying drawing, and particularly pointed out in the appended claims, it being understood that changes in the form, propor:

tion, size, and minor details may be made within the scope of the claims without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing there has been shown an elevation of the stamp-head of an ordinary stamp'mill, parts being broken away to show the mounting and operation of the present invention.

To illustrate the application and operation of the present invention, there has been shown in the accompanying drawing the head portion 1 of the frame of an ordinary stamp-mill, which head is supported in an elevated position by means of the legs or standards 2 in the usual manner, thereby forming an arched frame for the support of the steam-cylinder 3, which is mounted upon the top 01 the head of the frame. Depending from the cylinder and working through an opening in the head of the frame there is a piston-rod 4, to the lower end of which is connected the stampshaft 5 by means of the bonnet 6. The piston-rod and stamp-shart are elevated by steam-pressure, which is controlled by a single valve contained within the steam-chest 7, while the downward movement of the stampshaft and piston-rod is effected by gravity,

In carrying out the present invention the under side of the head 2 is provided with a socket or recess 8, into which is snugly fitted a block of rubber 9, which is of a thickness to project below the bottom of the head and has its lower projecting portion reduced so as to form an annular shoulder 10, which is overlapped by a metallic ring 11, that is secured to the bottom of the head by means of fastenings 12, whereby the rubber block is held in place. The top of the head is hollowed out around the opening for the piston-rod, so as to receive a suitable stuffing-box 13 to prevent leakage from the cylinder running down upon the rubber block 9. This rubber block or cushion is provided with a central longitudinal opening 14, slightly greater in diameter than the piston-rod 1, so as to avoid friction between these elements and consequent wear upon the cushion.

The top of the bonnet 6 is hollowed out to form a socket 15, into which is fitted a rubber block 16, having its upper end projecting above the top of the bonnet and reduced to form an annular shoulder 17, which is overlapped by the ring 18, applied to the top of the bonnet, there being suitable fastenings to secure the ring to the bonnet, and thereby hold the cushion in place.

In practice the stamp-shaft 5 is elevated by steam-pressure, and the upward movement of the shaft is cushioned by the contact of the cushioning members 9 and 16, the reaction of these members being sufficient to promptly start the shaft upon its return downward movement, which is continued by gravity without the aid of any extraneous means for giving the shaft an initial impetus. It will now be understood that beside cushioning the upstroke of the stamp-shaft the cushioning elements operate through their reaction to start the shaft downwardly, which is avery important feature of advantage in that it dispenses with the use of steam to start the stamp-shaft downwardly, and thereby simplifies the device and reduces the cost thereof and the expense attached to the running of the same.

In the application of the present invention no material change is required in the mill beyond the production of the seats or sockets for the reception of the cushion members and the dispensing with one of the usual cylindervalves.

Having thus described the invention, what is claimed is 1. In a stamp-mill, the combination of a frame having van elevated head pierced by a vertical opening, a stuffing-box within the upper end of the'opening, a cylinder supported upon the top of the head, a piston-rod working through the opening in the head and through the stuffing-box, a stamp-shaft carried by the piston-rod, anelastic cushion let into the under side of the head and surrounding the piston-rod, and another elastic cushionlet into the top of the shaft and projectingabove the same to engage the stationary cushion.

2. Ina stamp-mill, the combinationof a frame having an elevated head, a cylinder supported upon the head, a piston-rod Working through the head, a stamp-shaft carried by the piston, the under side of the head having a recess concentric with the piston-rod, I

with the piston-rod, an elastic cushion let into the recess and pierced by the piston-rod, the upper side of the cushion having a reduced concentric portion projecting above the stamp-sh aft, and a retaining-ring secured to the stamp-shaft and embracing the reduced portion of the cushion.

In testimony that we claim the foregoing as'our own we have hereto affixed our-signatures in the presence of two witnesses.

JOSEPH FRANCIS SYMONS. WILLIAlVI H. PAULL. Witnesses:

WILLIAM RELINE, OECILIA STE-FEES. 

